# -*- coding: UTF-8 -*-
import queue
import random
import sys
import time
from multiprocessing.managers import BaseManager


def master():
    # 发送任务的队列:
    task_queue = queue.Queue()
    # 接收结果的队列:
    result_queue = queue.Queue()

    # 从BaseManager继承的QueueManager:
    class QueueManager(BaseManager):
        pass

    # 把两个Queue都注册到网络上, callable参数关联了Queue对象:
    QueueManager.register('get_task_queue', callable=lambda: task_queue)
    QueueManager.register('get_result_queue', callable=lambda: result_queue)
    # 绑定端口5000, 设置验证码'abc':
    manager = QueueManager(address=('', 5000), authkey=b'abc')
    # 启动Queue:
    manager.start()
    # 获得通过网络访问的Queue对象:
    task = manager.get_task_queue()
    result = manager.get_result_queue()
    # 放几个任务进去:
    for i in range(10):
        n = random.randint(0, 10000)
        print('Put task %d...' % n)
        task.put(n)
    # 从result队列读取结果:
    print('Try get results...')
    for i in range(10):
        r = result.get(timeout=10)
        print('Result: %s' % r)
    # 关闭:
    manager.shutdown()
    print('master exit.')


def worker():
    # 创建类似的QueueManager:
    class QueueManager(BaseManager):
        pass

    # 由于这个QueueManager只从网络上获取Queue，所以注册时只提供名字:
    QueueManager.register('get_task_queue')
    QueueManager.register('get_result_queue')

    # 连接到服务器，也就是运行task_master.py的机器:
    server_addr = '127.0.0.1'
    print('Connect to server %s...' % server_addr)
    # 端口和验证码注意保持与master设置的完全一致:
    m = QueueManager(address=(server_addr, 5000), authkey=b'abc')
    # 从网络连接:
    m.connect()
    # 获取Queue的对象:
    task = m.get_task_queue()
    result = m.get_result_queue()
    # 从task队列取任务,并把结果写入result队列:
    for i in range(10):
        try:
            n = task.get(timeout=1)
            print('run task %d * %d...' % (n, n))
            r = '%d * %d = %d' % (n, n, n * n)
            time.sleep(1)
            result.put(r)
        except queue.Queue.Empty:
            print('task queue is empty.')
    # 处理结束:
    print('worker exit.')


if __name__ == '__main__':
    args = sys.argv
    e = args[1]
    if e == 'master':
        master()
    elif e == 'worker':
        worker()
    else:
        raise Exception('arg error.')
